Why is it das Onlinebanking?

Onlinebanking ends in -ing, and most nouns ending in -ing are neuter: in a German dictionary, 84% of them take das.

All nouns ending in -ing
Sense 1
das

Meaning

[1] The completion of banking transactions using an IT system

[1] die Erledigung von Bankgeschäften mittels einer EDV-Anlage

Examples

[1] I wrap almost all of my banking transactions via online banking

[1] Ich wickele fast alle meine Bankgeschäfte per Onlinebanking ab.

Declension

1 Singular Plural
Nominativ das Onlinebanking —
Genitiv des Onlinebanking des Onlinebankings —
Dativ dem Onlinebanking —
Akkusativ das Onlinebanking —

Pronunciation

Dictionary entries include material from Wiktionary. Wiktionary